0.51 Dyneema Composite Fabric vapor barrier socks
0.3oz for the pair. These are very basic, but work very well. Can be worn under a sock or in place of socks. They are intended to be baggy since DCF does not stretch. The material is thin enough that they don't feel bulky when bunched up. As a Vapor barrier liner these will last a long time. If you walk and/or run in them they will wear out from abrasion but will last much longer than any plastic bag. I can get around 50mi worth of runs in them and then some dyneema threads will lift out of the fabric and holes will develop. The structural integrity of the fabric will hold and the rest of the sock will still be impermeable, so they still generally work as a VBL but those small holes will allow water through when used as a WP sock.